I know exactly how you feel, and I think that a lot of people have bariatric surgery (of any kind) hoping or believing that it'll work like magic without any effort on their part. Sometimes that's because of poor pre-op education...not that their doctor lied to them, per se, but the bariatric team didn't give them the whole story.
But to be fair, I think that LBT members who are struggling, disappointed and suffering complications have as much right to post about their journeys as anyone else. If it seems that there are more negative posts than positive ones, it's probably because people tend to post more often when they're having problems than when they're doing fine. When I'm not in the mood to read the negative stuff, I do my best to ignore it.